caverna.cpp

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int main()
{
	ll n, k;

	cin >> n >> k;

	for (ll i = 1; i <= min(k, 80ll); i++) {

		if (n%i != i-1) {

			cout << "No\n";
			return 0;
		}
	}

	cout << "Yes\n"; 

	return 0;
}